The chemical can trigger health problems and causes more cancer than any other toxic air pollutant. Our reporters traveled around New York City and New Jersey with equipment to measure its presence. The results proved concerning.

Invisible Danger: Formaldehyde, a colorless pungent gas, can cause cancer, breathing problems and reproductive harms.

Greatest Threat: Most of us face the highest risks in our homes, where formaldehyde is released by some types of furniture, gas stoves and other everyday products.

Our Testing: We found concerning levels of formaldehyde in furniture stores, inside a nail salon, in cars and at a dinner party.